Im making a battery powered amp for around the campfire type situations, its in the order of 30W. Looking into speakers (I'm starting to get the feeling I should have done this first) and as a beginner in these things I am suffering severe information overload.

Not massively loud. I tend to drive to my camping locations so as long as they aren’t over about 4ft long transportation isn't an issue.

Quality wise Im thinking top end casual and low end audiophile. the source is(or will be) a Bluetooth module, Im not sure of the exact specs but Im hoping that it will be the limiting factor of quality.

My first inclination would be to recommend a fairly large medium to high Q full range, mounted in an open back cabinet - sort of like a guitar speaker. A similarly spec'd speaker in a sealed box is another good option. These options are both simple and effective, and there's not place for bugs or mice to hide.

Perhaps one of the Woden guys will chime in about which of those designs might be suitable for outdoors. It's possible one or more work great outside, but I haven't hear any of them.